CH233307A - Long distance telephone exchange equipment. - Google Patents
Long distance telephone exchange equipment.Info
- Publication number
- CH233307A CH233307A CH233307DA CH233307A CH 233307 A CH233307 A CH 233307A CH 233307D A CH233307D A CH 233307DA CH 233307 A CH233307 A CH 233307A
- Authority
- CH
- Switzerland
- Prior art keywords
- long distance
- telephone exchange
- exchange equipment
- distance telephone
- equipment
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB233307X | 1938-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH233307A true CH233307A (en) | 1944-07-15 |
Family
ID=10193869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH233307D CH233307A (en) | 1938-12-14 | 1940-02-07 | Long distance telephone exchange equipment. |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE437367A (en) |
CH (1) | CH233307A (en) |
FR (1) | FR862315A (en) |
NL (1) | NL61476C (en) |
-
0
- NL NL61476D patent/NL61476C/xx active
- BE BE437367D patent/BE437367A/xx unknown
-
1939
- 1939-12-12 FR FR862315D patent/FR862315A/en not_active Expired
-
1940
- 1940-02-07 CH CH233307D patent/CH233307A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FR862315A (en) | 1941-03-04 |
BE437367A (en) | |
NL61476C (en) |
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